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Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods

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Abstract

Ultrafine-grained samples were produced from a Ni nanopowder by hot isostatic pressing (HIP) and spark plasma sintering (SPS). The microstructure and mechanical behavior of the two specimens were compared. The grain coarsening observed during the SPS procedure was moderated due to a reduced temperature and time of consolidation compared with HIP processing. The smaller grain-size and higher nickel-oxide content in the SPS-processed sample resulted in a higher yield strength. Compression experiments showed that the specimen produced by SPS reached a maximal flow stress at a small strain, which was followed by a long steady-state softening while the HIP-processed sample hardened until failure. It was revealed that the softening of the SPS-processed sample resulted from microcracking along the grain boundaries.

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Acknowledgments

We are grateful for the support of the Hungarian TeT Foundation (KPI) under Contract No. F-47/2006 (Balaton project). This work was supported by the Hungarian Scientific Research Fund, OTKA, Grant Nos. K67692 and K71594. J.G. is grateful for the support of a Bolyai Janos Research Scholarship of the Hungarian Academy of Sciences and the help of Noemi Szasz in x-ray diffraction experiments. G.F.D. is grateful for the support of ÉGIDE, in the framework of the Hubert Curien Project (PHC Balaton).

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Authors and Affiliations

  1. Department of Materials Physics, Eötvös University, Budapest, H-1117, Hungary

    J. Gubicza

  2. Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux–Centre National de la Recherche Scientifique, Université Paris 13, 93430, Villetaneuse, France

    H.-Q. Bui, F. Fellah & G. F. Dirras

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  1. J. Gubicza
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Correspondence to J. Gubicza.

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Gubicza, J., Bui, HQ., Fellah, F. et al. Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods. Journal of Materials Research 24, 217–226 (2009). https://doi.org/10.1557/JMR.2009.0010

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